Which of the following classes refers to a refrigerant with high toxicity?

• A. Low Toxicity
• B. High Toxicity
• C. Moderate Toxicity
• D. Unknown Toxicity

Answer: (B)

Toxicity classification for refrigerants reflects how hazardous they are to people if inhaled. A refrigerant described as high toxicity means exposure can cause serious health effects, even at lower concentrations, so it’s treated as a severe occupational hazard. That’s why this option is the best fit: it directly communicates the greater risk and the need for stringent controls like effective ventilation, continuous leak monitoring, strict access restrictions, and appropriate protective equipment. The other labels imply lower or uncertain risk, which wouldn’t warrant the same level of precaution.